Setting Paypal eCart 4

Setting Paypal eCart 4

During the Checkout Wizard, I entered PayPal. Then eCart generated a Username, Password, and Signature. I already have a PayPal business account. Do I use the info generated by eCart here or do I request my own API information from PayPal and then type over this auto generated info in eCart?

I did not enter any information in those fields. They appeared. I thought that ecart generated that info: User, Password, SIgnature. I did not type this stuff. They were very long and would have been hard to even retype. How could info be there if I did not type it?

A couple of years ago, I set up a "Pay Invoice" page on our website using paypal. It is a no-nonsense page that is simply a form that lets the person type in the invoice number and the total amount they want to pay. One button takes them to paypal. I did not use the ecart. Could the ecart have found this info in Dreamweaver and entered it for me?